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IQR Calculator - The interquartile range (IQR) measures the spread of the middle half of your data. Using the IQR formula, we need to find the values for Q3 and Q1. To do that, simply order your data from low to high and split the value into four equal portions.quartiles allow researchers to easily see where the borders are between the first 25% of the data and the second 25% of the data, known as the first quartile, as well as the border that marks the 75% mark of the data set, known as the third quartile.